A longitudinal transcriptomic analysis of Rhipicephalus microplus midgut upon feeding

Area of Science:

• Veterinary Entomology
• Molecular Biology
• Parasitology

Background:

• Rhipicephalus microplus is a significant cattle parasite impacting livestock production.
• Tick midgut physiology is vital for blood meal processing, pathogen acquisition, and transmission.
• Limited understanding of tick midgut function hinders effective control strategies.

Purpose of the Study:

• To conduct a comprehensive longitudinal transcriptome analysis of the Rhipicephalus microplus midgut during various feeding stages.
• To identify differentially expressed genes and functional classes within the tick midgut.
• To provide temporal insights into midgut physiology for developing novel tick control methods.

Main Methods:

• Longitudinal transcriptome analysis of adult female Rhipicephalus microplus midguts at different feeding stages.
• De novo assembly and coding-sequence (CDS) extraction to identify potential genes.
• Functional annotation and differential expression analysis of selected transcripts (TPM ≥ 3).

Main Results:

• Identified 60,599 potential CDS, with 10,994 CDS meeting expression criteria and categorized into 24 functional classes.
• Revealed three distinct transcriptional profiles corresponding to slow-feeding, rapid-feeding, and post-detachment stages.
• Observed significant transcript modulation up to 48 hours post-detachment, with peak activity during the feeding stages.

Conclusions:

• The study provides a temporal overview of Rhipicephalus microplus midgut transcriptional changes during feeding.
• Identified key functional classes, including protein synthesis and secreted proteins, active during feeding.
• The findings contribute to understanding tick physiology and identifying potential targets for anti-tick strategies.